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Does the vapor barrier need to perfectly intact?

I will be developing my basement, using drywall for the walls. My home is relatively new and the basement was insulated with fibreglass and vapor barrier stapled over it. The vapor barrier is in very good shape, but there are a few nicks in it, but not very many. Furthermore, I need to pull up some of it in order to run wire through the studs for duplex receptacles, etc, so there will be additional nicks where the previous staples were. So my question is does vapor barrier to be pristine in order to be effective (and so I so should just completely replace mine) or is still effective with some nicks (just reuse what I have)?